refactor: python implementation of audioop.mul

CHANGELOG.md

@@ -75,6 +75,9 @@ These changes are available on the `master` branch, but have not yet been releas
 
 ### Changed
 
+- Replaced audioop (deprecated module) implementation of `PCMVolumeTransformer.read`
+  method with a pure Python equivalent.
+  ([#2176](https://github.com/Pycord-Development/pycord/pull/2176))
 - Suppressed FFMPEG output when recording voice channels.
   ([#1993](https://github.com/Pycord-Development/pycord/pull/1993))
 - Changed file-upload size limit from 8 MB to 25 MB accordingly.

discord/player.py

@@ -25,7 +25,6 @@
 from __future__ import annotations
 
 import asyncio
-import audioop
 import io
 import json
 import logging
@@ -36,6 +35,8 @@
 import threading
 import time
 import traceback
+from itertools import chain
+from math import floor
 from typing import IO, TYPE_CHECKING, Any, Callable, Generic, TypeVar
 
 from .errors import ClientException
@@ -652,6 +653,11 @@ class PCMVolumeTransformer(AudioSource, Generic[AT]):
     This does not work on audio sources that have :meth:`AudioSource.is_opus`
     set to ``True``.
 
+    .. versionchanged:: 2.5
+
+        Replaced audioop implementation of :py:meth:`discord.PCMVolumeTransformer.read`
+        method with a pure Python equivalent.
+
     Parameters
     ----------
     original: :class:`AudioSource`
@@ -691,8 +697,30 @@ def cleanup(self) -> None:
         self.original.cleanup()
 
     def read(self) -> bytes:
+        maxval = 0x7FFF
+        minval = -0x8000
+
         ret = self.original.read()
-        return audioop.mul(ret, 2, min(self._volume, 2.0))
+        samples = bytes(
+            chain.from_iterable(
+                int(
+                    floor(
+                        min(
+                            maxval,
+                            max(
+                                int.from_bytes(
+                                    ret[i * 2 : (i + 1) * 2], "little", signed=True
+                                )
+                                * min(self._volume, 2.0),
+                                minval,
+                            ),
+                        )
+                    )
+                ).to_bytes(2, "little", signed=True)
+                for i in range(len(ret) // 2)
+            )
+        )
+        return samples
 
 
 class AudioPlayer(threading.Thread):